Are you using CCITTFaxDecode in you post script..??
or is the image embeded into the postscript file..?

if (using CCITTFaxDecode) 
look at libtiff
http://www.libtiff.org/

do a tiffinfo -s foo.tiff
and make sure that you tiff file is in a format that
CCITTFaxDecode understands.
if it is not then you can copy it into the format with 
tiffcp

Jeff

On Fri, Jul 20, 2001 at 03:06:03PM -0400, Mike Markowski wrote:
> Hi all,
> 
> This is not a pure gimp question, but I expect other gimpers out
> there might have come across it.  After spending a good bit of time
> on an image, I'm having trouble with - I think - the postscript
> conversion.  We have an HP2500cp PostScript printer (prints on rolls
> 36" wide).  After writing out my gimp image as a tiff file, I used
> ImageMagick to convert it to PS at Architecture D size, which is 36"
> x 24": 
> 
>       convert -page ArchD sr.tiff sr.ps
> 
> While the tiff file looks great on screen and I've seen very nice
> photo quality output from this printer, my converted image looks
> awful; loads of dithering.  Does anyone know what I might be doing
> wrong or what important step or steps have been overlooked?
> 
>       Thanks very much,
>       Mike
> _______________________________________________
> Gimp-user mailing list
> [EMAIL PROTECTED]
> http://lists.xcf.berkeley.edu/mailman/listinfo/gimp-user
Thanks, 
Jeff

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| If we trace out what we behold and experience through the language of logic, we are  
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| doing science. If we show it in forms whose interrelationships are not accessible to 
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| conscious thought but are intuitively recognized as meaningful, we are doing art. 
|Common  |
| to both is the devotion to something beyond the personal, removed from the 
|arbitrary.     |
|                                                                        -- Albert 
|Einstein |
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| Jeff Sheffield                                                                       
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| [EMAIL PROTECTED]                                                                       
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